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#astrophysicist #astronomer #space scientist #stellar physics #telescope user #star gazer #observational astronomy

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#astrometry #stellar position #angular measurement #celestial mechanics #observational astronomy

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#star chart #sky mapping #observational astronomy #astronomical instruments

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#astronomical photometry #stellar photometry #apparent magnitude #absolute magnitude #light curve #astrophysics #observational astronomy

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#galileo #heliocentric discovery #observational astronomy #sun centered proof